Blood gas analyses on equine blood: required correction factors [see comment].

This research investigated how to accurately measure blood gas levels (oxygen and carbon dioxide) and pH levels in horse blood, explaining the necessary correction procedures needed to obtain the most precise measurements.

Explanation of the Research Paper

• The research aimed to acquire determinable correction factors to better estimate the acidity (pH), oxygen partial pressure (PO2) and carbon dioxide partial pressure (PCO2) in horse blood using standard blood gas and pH detectors.
• A significant discrepancy was found in the oxygen readings (PO2) between tonometred blood (blood pressure measured at the eye using a tonometer) of most horses and the setting gas. This alerted the researchers that a correction factor was required if the oxygen electrode was calibrated with a specified gas.
• According to the research findings, this correction factor should be obtained by tonometering a blood sample from each horse. Interestingly, it was found that this factor does not depend on the packed cell volume (the volume percentage of red cells in blood).

Evaluating Required Corrections

• The paper also found that no correction was required for the carbon dioxide (PCO2) electrode, implying that the current calibration methods are accurate for this particular test.
• However, researchers noted that if the body temperature of the horse deviates from the analyzer’s temperature, corrections must be made to the PO2, PCO2, and pH readings. These readings need to be adjusted to match the horse’s actual body temperature.
• The temperature correction factors that were determined for horse blood in the study were, surprisingly, similar to those for human blood.

Importance of Temperature Corrections

• The researchers emphasized that omission to rectify temperature disparities may lead to errors in the readings of oxygen and carbon dioxide levels.
• The magnitude of these inaccuracies can be as much as 6 to 7 per cent per degree of temperature difference, which indicates the significant role temperature plays in precision.
• Therefore, the research stresses the importance of correcting for body temperature when measuring blood gas and pH levels in horse blood to ensure accurate results.